To measure the altitude of a heavenly body (sun, star, etc.) in order to determine the latitude and longitude.
Sextant used to measure angles between objects, especially celestial objects in relation to the horizon, in order to determine position at sea. Marins sextants are often larger and more solidly made than those used for land surveys; They also are fitted with shades, for sighting the sun. (Expl glossary) This sextant fitted with battery-powered light over vernier, and locking mechanism on index arm.
Used aboard the RCMP Arctic patrol schooner 'St. Rock' (1928-1950). The St. Roch was the first ship to cross the northwest passage from west to east (1942) and back (1944), and the first ship to circumnavigate North America (1950). It was retired in 1958: In 1962 it was declared a National Historic site. (Ref. 2).
Metal casing (probably brass); Glass optics.
Number of Parts
Dull grey-black finish applied to most surfaces of sextant(.001) and accessories (.002 - .004). silver scale; Off-white fine adjustment dial. Pt. wooden case is stained and varnished; Some green felt liners over supports.
"25014" & broad arrow symbol incised on casing, at eyepiece end.
From CA of 08/21/1995 by Tony Missio: Undetermined